¿Qué características tenían las instituciones o civilizaciones complejas?

In one to two paragraphs, compare and contrast the american, french, and mexican revolution.

Which of the following is/are a major technological advances of the mayan civilization? a. the calendar c. math b. architecture d. all of the above

How many people died in battle during world war 1? a. 8-9 mill b. 3-4 mill c. 1 mill d. more than 10 mill