Which historical even was greatly responsible for global stratification as we see it today?

Which statement best describes the weather shown by the red semi circles on a line on a weather map a warm front brings drizzly weather a cold front can cause heavy rain, thunder, and lightning a stationary front may produce rainy or snowy weather for several days an occluded front can cause light to heavy precipitation that may last several days

Restricting immigrants from entering a country may be based on what belief?  

How did the romanov dynasty increase russia's power?