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The United States feared that if communism was successful on Vietnam, the rest of the countries that border it would soon turn into communism and those other countries that border that new communist country would also be converted to communism and so on. This is called the "domino theory" and made the United States to send troops to prevent the theory from happening.
Three-Fifth Compromise is your answer
In an effort to garner more congressional members, the South came out with the <em>Three-Fifth Compromise</em>, which means that slaves count as 3/5 of a person, which can greatly increase the population of the South.
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A presidential government is based on the relationship between the legislative power and the executive.
The presidential system or presidential system is a form of government in which, once a Republic is constituted, the Constitution establishes a division of powers between the executive power, the legislative power, the judiciary, and the head of state, in addition to holding representation formally of the country, is also an active part of the executive power, as Head of Government, thus exercising a dual function, because he has the powers of the Government, being elected directly by the voters and not by Congress or Parliament.
The president is the body that holds the executive power, while the legislative power usually concentrates the congress, without prejudice to the powers that the president has in legislative matters.
It was where many Asian immigrants opposed reform efforts