I thinks it’s cause They saw they work?
It basically gives stability and tranquility to all the states, if the federal government is too much, stronger states can prey on weaker states looking for their wealth. The Federal System stablishes general rule sto be shared with all the states and the states have their degree of freedom to enfore some laws according to their own context.
<span>The Monroe Doctrine could have been considered a huge gamble for the U.S. because Europe's invasion of Latin America, as the U.S. was not strong enough militarily to have stopped the European powers and unable to prevent economic collapse which causes huge damage.</span>
b. there was an extensive network of roads