Southeast Asia commanded the sea Lanes between India and Asia
Answer:
The expansion westward led to the territorial expansion of the United State
Explanation: Westward expansion was responsible for the expansion of the nation.
I'm assuming you'ret talking about either WWII or WWI, but it's the same concept. They made sure everybody knew about it. Posters were everywhere letting people know about their fellow Americans in the war and to donate lots of money and supplies.
Hope this helps!!