2) Did economic development and westward expansion affect all parts of the nation the same?

No, the different geographical and cultural backgrounds of the U.S combined with westward expansion had a unique effect across its territories.

Explanation:

The issue of slavery became deep when the new territory brought in the landscape. The established states were increasingly broken apart as the nation gradually expanded. The economic and social differences became more prominent and both North and South latched to their practices and traditions. The late 1800s witnessed the growth of American urban society through immigration and expansion of the territory. As the requirements of factory employees became more significant, the disparity in demands between rural and urban populations of America heavily influenced the national landscape.

hitler was elected as a strong leader by germans who felt angry following the treaty of versailles.