Consider modern cities. What problems that existed at the turn of the 20th century have been fixed? Which do you think still exist?

It depends on what you mean by modern. Is Calcutta modern?

One would hope that water and sewage problems have been fixed, health problems, and sanitation. However, in some "modern" cities, it is not yet done.

Income inequality, poverty, and homelessness are still major issues in many modern cities. In addition, traffic congestion, air pollution, and overcrowding are still major problems in many cities. Crime, violence, and gang activity are also still major issues in many cities. Finally, access to quality education and healthcare are still major issues in many cities.

Well, it seems like you're trying to sneak a serious question in there! Alright, I'll give you a semi-serious answer.

In many modern cities, significant progress has indeed been made in areas such as water and sewage systems, public health, and sanitation. Many cities have improved their infrastructure to ensure cleaner and safer living conditions for their residents. But, alas, not all cities have fully eliminated these problems. Some still struggle with outdated or inadequate systems, which can lead to various challenges.

That being said, there are always new problems cropping up in modern cities. Traffic congestion, pollution, urban sprawl, and high housing costs are just a few examples of challenges that persist today. It's a constant battle to balance the needs of a growing population with the resources available.

But hey, at least we can thank modern cities for giving us an abundance of coffee shops and Wi-Fi, right? Always gotta find a silver lining!

At the turn of the 20th century, many cities faced various challenges related to infrastructure, health, and sanitation. Here are some problems that have been generally addressed or fixed in modern cities:

1. Water and Sewage Systems: Most modern cities have successfully improved water supply systems, ensuring clean and reliable access to water for residents. Additionally, sewage systems have been developed to efficiently manage wastewater and prevent contamination.

2. Health and Sanitation: Significant progress has been made in improving public health and sanitation systems. Access to healthcare, disease control measures, and waste management practices have been implemented to enhance public well-being.

3. Transportation: The transportation systems in modern cities have advanced significantly since the early 20th century. Many cities now have comprehensive public transportation networks such as metros, buses, and trams, facilitating efficient and convenient commuting.

4. Housing Standards: Building codes and regulations have been established to ensure safer and healthier living conditions. Improvements in construction techniques and infrastructure have contributed to better housing standards in modern cities.

However, despite these advancements, several problems still persist in modern cities:

1. Traffic Congestion: As cities continue to grow and populations increase, traffic congestion remains a common issue. The influx of private vehicles and inadequate infrastructure can lead to gridlock and lengthy commutes.

2. Pollution and Environmental Impact: Many modern cities still struggle with high levels of air pollution, water pollution, and waste management challenges. These issues have adverse effects on the environment and public health.

3. Inequality and Social Issues: Even though modern cities have made progress, socio-economic disparities and social issues remain prevalent. Income inequality, homelessness, and lack of affordable housing are problems that persist in many urban areas.

4. Urbanization Challenges: Rapid urbanization can create additional problems such as overpopulation, strain on resources, and insufficient urban planning. These challenges require continuous efforts to manage urban growth effectively.

5. Aging Infrastructure: Some cities still face challenges related to aging infrastructure systems that require constant maintenance and upgrades. This includes issues with water supply networks, sewage systems, and transportation infrastructure.

It is important to note that while some of these problems may exist in certain cities, others have made significant strides in addressing them. Urban planning, sustainable development, and technological advancements continue to drive progress in creating more efficient, livable, and sustainable modern cities.

To determine the problems that have been fixed in modern cities since the turn of the 20th century and those that still persist, one should consider various factors such as urban development, technological advancements, and local government initiatives. Here's the process you can follow:

1. Define the Turn of the 20th Century: The 20th century began on January 1, 1901, and ended on December 31, 2000. Therefore, consider the time between these years as the reference point for comparing the problems.

2. Identify Problems at the Turn of the 20th Century: Research and review historical records, books, and literature to identify the main problems faced by cities during that period. Some common issues might include poor sanitation, inadequate water supply, transportation congestion, housing shortages, pollution, and the lack of basic infrastructure like electricity and telecommunication.

3. Compare with Modern Cities: Look at the present conditions in modern cities and assess whether the problems identified in step 2 have been addressed or still persist. Check reliable sources such as academic research, city development reports, official city plans, or government websites. Consider factors such as technological advancements, urban planning, government policies, and public awareness.

4. Water and Sewage Problems: Determine if modern cities have successfully resolved water and sewage problems. Look for improvements in water treatment facilities, access to clean drinking water, efficient sewage systems, and wastewater management. Check for evidence of reduced waterborne diseases and improved overall hygiene.

5. Health Problems: Examine whether health problems have been mitigated in modern cities. Analyze public health initiatives, improved medical facilities, and disease control measures. Look for evidence of reduced rates of infectious diseases, improved sanitation practices, better air quality, and access to healthcare services.

6. Sanitation: Assess the state of sanitation in modern cities. Consider the availability of public toilets, waste management systems, recycling programs, and cleanliness standards. Look for efforts to maintain cleanliness, reduce litter, and promote sustainable waste management practices.

7. Other Considerations: Additionally, consider aspects like transportation infrastructure, urban planning, housing conditions, pollution levels, and access to basic services such as electricity and telecommunication. Compare these factors with historical records to evaluate improvements or persistent issues.

8. Individual City Variations: Understand that the level of development and progress may vary from city to city, even within the same country. Therefore, it's essential to consider each city individually, rather than making broad generalizations.

Remember that this analysis requires thorough research and access to reliable information sources to draw accurate conclusions about the problems that have been fixed and the ones that still exist in modern cities.