Competition and promises are the main 2
Answer:
The president can veto any bill passed by Congress, but a two-thirds vote in Congress can override the veto, and the Supreme court can rule it constitutional or unconstitutional.
Explanation:
Well, I can tell you for sure that a is not the answer. But I think the answer would be b.
The name for this idea is "Domino Effect" - this is a theory that says that if one country falls to Communism the neighboring countries would also fall to Communism, much like pieces of Dominos fall when a neighboring piece fell.
This theory was important in the Foreign politics of the US during the cold war.
