Some factors to which the start of WW1 can be traced are:
1) the rise of nationalism in Europe, for example among the Serbians and Bosnians
2) building of big military alliances in Europe (this is what make the conflict into a world war
3) the direct cause was the assassination of the Austrian Crown Prince Franz Ferdinand
The Embargo Act of 1807 stopped trade with England, thus decreasing American production. FALSE.
It had been at Pearl Harbor