It was a chain reaction. Long story short, the countries were pulled into the war because of agreements they had with their allies. This treaty is what caused the countries to enter WWI, to protect and defend their allied countries who were already in the war.
The siege of Vicksburg was a major victory for the union because in capturing the city, the union had now captured the Mississippi River which would enable the union to use the river as a transportation waterway for supples and reinforcements. It also divided he South and made communication more challenging for it. Hope this helps!
Because they are all in sense racist laws. They all demonized black people. From KKK thrusting their lives, Jim Crow Laws singling them out.
it was marked by a great degree of cooperation and was essential to securing the defeat of Nazi Germany