The main event that led the United State to take a more active role in the world affairs was World War II, since the US emerged from this war an economic superpower. It was also clear that some nation needed to "fill the void" left by the relative fall of the British Empire.
Pharriess of masters of the law
They would travel on foot
of course it does many things in history caused how we are now, such as ww1 without it there would be no ww2 or no cold war ww1 was a big turning point in history cause it set out the rest of the 20th century