2. The new boundary line set by the Adams-Onis Treaty had which of these affects?

a) It created a system of dual governance in Florida.
b) It represented the completion of Manifest Destiny.
c) It began the decline of Spain's New World empire.
d) It allowed the United States to develop Florida's resources.

I agree. D.

What do you think it is?

c) It began the decline of Spain's New World empire.

To determine the correct answer, let's analyze each option:

a) It created a system of dual governance in Florida.
To verify this option, we need to look up information about the Adams-Onis Treaty and how it affected the governance of Florida.

The Adams-Onis Treaty, also known as the Transcontinental Treaty, was signed in 1819 between the United States and Spain. It aimed to settle territorial disputes between the two nations. After the treaty, Spain ceded Florida to the United States.

Upon investigation, we find that the Adams-Onis Treaty did not establish a system of dual governance in Florida. Instead, it transferred the entire control of Florida to the United States. Therefore, option a) is incorrect.

b) It represented the completion of Manifest Destiny.
Manifest Destiny was a belief held by many Americans during the 19th century. It claimed that the United States was destined to expand across the North American continent. The Adams-Onis Treaty did not represent the completion of Manifest Destiny since its main purpose was to resolve territorial disputes with Spain and solidify the borders between the two nations. Therefore, option b) is incorrect.

c) It began the decline of Spain's New World empire.
To verify this option, we need to examine the effects of the Adams-Onis Treaty on Spain's New World empire.

The Adams-Onis Treaty was a significant blow to Spain's New World empire. It resulted in Spain giving up its claim to Florida and also confirmed the United States' control over the Oregon Territory. The loss of Florida was part of a larger trend as Spain's empire in the Americas gradually declined during the 19th century. Therefore, option c) is correct.

d) It allowed the United States to develop Florida's resources.
To confirm this option, we should investigate whether the Adams-Onis Treaty provided the United States with the opportunity to develop Florida's resources.

While the Adams-Onis Treaty did transfer control of Florida to the United States, it did not specifically address the development of the state's resources. The primary focus of the treaty was to resolve territorial disputes and establish clear borders. Therefore, option d) is incorrect.

In conclusion, the correct answer is c) It began the decline of Spain's New World empire. The Adams-Onis Treaty led to Spain giving up control of Florida and was part of a larger trend of Spain's decline in the New World during the 19th century.