What are the differences and similarities between the Articles of Confederation and the Constitution?

In both, the laws are made by the legislature, whereby the articles of confederation have only one house which is referred to as Congress, and the constitution has got two houses. The articles of confederation do not recognize any executive, but the constitution acknowledges the president as the executive.

so they can defeat there oppenent

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.