There are more than three reasons why this happened of course but the best three are there they needed more land, resources, and some way to escape the cold.
The cotton gin made it easy for slaves to separate seeds out of the cotton. However, it it increased slave usage all over. It actually increased the use of slavery. The cotton gin just made one part of a slaves job quicker and easier.
I think that the best answer is Middle East: among the earliest metal tools were tools from Egypt, and also Hittites were early tool makers, some early works were also done in Iran.
Political and ethnic rivalries within the countries emerged after independence, due in large part to the poor drawing of the former colonies' borders, which were drawn by their former imperial rulers.
