What was the primary reason for the announcement of the Monroe Doctrine in
1823?

The European powers, according to Monroe, were obligated to respect the Western Hemisphere as the United States' sphere of interest. President James Monroe's 1823 annual message to Congress contained the Monroe Doctrine, which warned European powers not to interfere in the affairs of the Western Hemisphere.

Explanation:

a

explanation:

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.