I don't understand this.

I have a graph in my American history and it is labeled on the side "1995 Dollars in Billions"
In 1965, it has $264 and in between 1965 and 1970, it is at $352 and then in 1970, it goes back down to about $264 again.
Then the question is:
What event would explain the spike between 1965 and 1970?
Help??
Also, why does the budget change from year to year???

To understand the spike between 1965 and 1970 on the graph labeled "1995 Dollars in Billions," you need to consider historical events that occurred during that time period which could have influenced the increase in spending. Here's how you can approach finding the answer:

1. Identify the historical events: Start by researching major events or developments that took place during the mid to late 1960s. Look for events related to government spending, economic policies, wars, or other significant factors that could have impacted the budget during that time frame.

2. Analyze the data: Examine the trend in the graph between 1965 and 1970. Consider the rise in expenditure from $264 to $352 billion and then a decrease back to $264 billion in 1970. Look for any patterns or sudden changes that could be linked to specific events.

3. Check historical records: Look for government budget records, historical archives, or reputable sources that provide information on federal spending during the 1965-1970 period. These records can give you an accurate breakdown of how the budget allocation changed between those years.

4. Consider economic factors: Take into account the economic climate during that time, such as inflation rates, GDP growth, or any other economic indicators that could explain the increase or decrease in budget spending.

Combining the historical context, budget records, and economic factors should provide insights into what event or events caused the spike between 1965 and 1970.

Regarding your second question, the budget changes from year to year due to a variety of factors. Here are a few reasons why the budget may fluctuate:

1. Economic conditions: Economic conditions, such as changes in inflation rates, unemployment levels, or GDP growth, can influence government spending. During recessions or periods of economic downturn, there may be a need for increased spending on social welfare programs or economic stimulus packages.

2. Policy Priorities: Each year, the government sets its policy priorities which determine how funds are allocated. Changes in legislation, government initiatives, or shifts in public opinion can lead to adjustments in budget allocations for various sectors such as education, defense, healthcare, infrastructure, etc.

3. External Events: Unexpected events such as natural disasters, wars, or global crises can have a significant impact on the budget. These events often require emergency funding or redirection of resources to address immediate needs.

4. Political Factors: Political factors, including changes in the party in power, election cycles, or political agendas, can influence budgetary decisions. Different administrations or political parties may have varying priorities, leading to changes in the budget allocations.

It is important to note that the budget is a complex process influenced by a wide range of factors, and understanding the specific reasons for the changes in any given year requires a thorough examination of the economic, political, and policy landscape during that time.