What is main theory of how Native American Tribes came to North America and why?

The main theory is that Native Americans reached North America from East Asia, more specifically Siberia, around 14,000 years ago.

The reason why this is the most accepted theory is because it has been proven by genetic studes that Native Americans and East Asians share a great degree of genetic similarity.

According to this theory, at that time, the Bering strait was frozen, and formed a land bridge between Siberia and Alaska. East Asians crossed this bridge, probably following wild game, and entered the American Continent.

the labor movement in the united states grew out of the need to protect the common interest of workers

for those in the industrial sector organized labor unions fought for better wages reasonable hours and safer working conditions

  in the 19th century trade unionism was mainly a movement of skilled workers.

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