A. Egypt and Isreal.
Fun fact, we the United States give Isreal 2 billion a year and because of this peace treaty have to also give Egypt 2 billion.
Answer:
High temperatures, poor agricultural practices and resulting wind erosion.
The US's the fear of Radicals and the Bolshevik revolution in Russia. US Police roundedup suspected foreign born radicals and had them expelled from the United States. Fed growing demands to limit immigration.
The Mayans used a pyramid and the sun to help them create a calendar.