Summarize the events that led up to the second world war.3 to 5 sentences please.​

Explanation:

hilters invasion of Poland in 1939 drove great Britain and France to declare war on Germany starting the beginning of ww2

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

the border between arizona and new mexico is a thin, black line; this indicates a state boundary.

its correct: it's a thin line, and it's a state boundary, correct