How did Americans' opinions on overseas expansion begin to change in the 1800s?

Americans' opinions on overseas expansion began to change in the 1800s due to a combination of various factors. To understand this, we can examine the contextual events and ideology prevalent during that time.

1. Manifest Destiny: In the early 1800s, the concept of Manifest Destiny, the belief that it was America's destiny to expand its territory from coast to coast, was popularized. This resulted in an initial focus on westward expansion within the United States, as opposed to overseas.

2. Economic Factors: As the United States developed economically, there was increased interest in expanding trade with other nations. The Industrial Revolution and advancements in transportation, such as the steam engine and the development of railroads, facilitated this desire for overseas markets.

3. Global Competition: The United States faced increasing global competition with other European powers in terms of colonization and trade. European countries, such as Britain and France, were actively expanding their empires, leading American policymakers to consider the benefits of overseas expansion to secure national interests.

4. Naval Power and Military Strategy: Influenced by the ideas of Alfred Thayer Mahan, an influential naval strategist, many believed that acquiring overseas territories would provide strategic advantages in terms of military bases and naval power projection. This belief further fostered support for expansion.

5. The Spanish-American War: The Spanish-American War in 1898 played a prominent role in shifting public opinion. The conflict, driven by U.S. intervention in Cuba and the sinking of the USS Maine, led to American victories in the Philippines, Guam, and Puerto Rico. This military success contributed to a more positive perception of overseas expansion.

It is important to note that Americans' opinions on overseas expansion were not universally shared. There were critics of expansion for various reasons, including concerns about imperialism, opposition to engaging in conflicts outside the country, and potential violations of the principles of self-determination.

To explore this topic further, you can reference primary sources such as speeches, newspaper articles, and political debates of the time. Additionally, studying historical events like the Louisiana Purchase, the Monroe Doctrine, and the Open Door Policy can provide insights into how Americans' opinions on overseas expansion evolved.