Thomas Jefferson explanation because he wrote most of the deceleration of independence and had some changes to get approved (: hope this helps
There were actually four HUGE causes for WW1, treaties and alliances brought many countries into war, the imperialism of some countries scared other countries, and they were "defending" themselves, there was a lot of weapons stocking, and countries were creating gigantic armies, and that threatened other countries, and then we have plain old nationalism.
They needed to have enough supply for food is what I would say because if you don't eat you will eventually get weak and die.
Hope It Helped :D
July 4, 1776 is when the Declaration of Independence was adopted by the congress