Why did the delegates meet at the Constitutional Convention in 1787?

Although a number of things brought about world war one there was one even that push to europe over the edge. what was that event?

It can be inferred that the dramatic increase in defense spending by germany was the result of. (a) attempts by great britain to take german colonies. ( b) fear of a two-front war against france and russia (c) the need to put down a communist rebellion (d) a competition with the allies to produce atomic weapons

Who coined the phrase “go west and grow with the country”?