What weather is associated with cA air masses? occasional periods of clear, cool weather in the summer hot humid conditions leading to cumulus cloud development and showers or thunderstorms cold waves in winter nor'easters

Answerepicenter;

Answer(say);

Ibelieve it was because of the gas act in order to preserve fuel 

The first immigrants to settle in what is now the united states were the ancient ancestors of modern native americans. the precise routes of those first north american immigrants are disputed, but there is no uncertainty about the fact that every human being on the continent is either a recent immigrant or a descendant of earlier immigrants. since the first immigrants came here from asia more than thirteen thousand years ago, there have been four large and easily recognizable modern waves of immigrants into the united states.