How did the drive for empires led to World War II?

This chart shows american troop strength during what conflict? a) gulf war b) korean war c) vietnam war d) world war ii

The second continental congress: a. made provisions for a continental army with george washington as commander-in-chief b. adopted a “declaration of causes of necessity of taking up arms” c. endorsed the olive branch petition d. all of the above

Why was the united nations established