Why did the giant mastodons and mammoths gradually disappear

It is not known for sure why they were extinct, many scientists believe that extinction was due to hunting, while other scientists believe that extinction was due to climate changes that destroyed the vegetation that these animals ate.

Explanation:

Mastodons and mammoths were animal-like elephants that inhabited the Earth in large groups, thousands of years ago. Scientists are not sure why mastodons and mammoths have disappeared. It may have been because of climate change in the environment in which they lived. Experts believe that the weather began to cool and thick ice sheets covered vast areas. This put an end to the pastures in which these animals lived and fed. On the other hand, other scientists agree that they were extinguished by the hunt made by the human being in search of meat.

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.

the industrial revolution pushed the world into modern industrialization. it changed the course of history profoundly. it caused rapid urbanization and pushed cities and countries into development. the industrial revolution began in great britain with a series with new inventions which led to the creation of machines and mass production.

this caused the country to gain wealth and money and become an international superpower. it improved transportation and manufacturing inside the country, pushed people to live in urban areas and britain to become the most powerful nation in the world for a while.