Answer:
Economic, Environmental and political.
Explanation:
Permanent move from one country to another due to various reasons is called migration. Throughout history people has moved from one place to another to explore their world. Migration has impacted world culture since its beginning.
There are three main causes for migration, It falls into three categories: Economic, Environmental and political. While speaking of migrations experts talk about push and pull factors.
The factors that push people out of an area are called push factors while the factors that pull people toward an area is called pull factor. Ex. while talking about the environment lack/depletion of natural resources can be a push factor while availability of land at some other place can be a pull factor.
A because he was hated by northerners, did not lead the Confederate army, and did not carry out the March to the Sea.
I think this might help.
Avian influenza (bird flu) has the potential to cause a healthcare crisis of unprecedented
global dimensions. Many predict a global pandemic far worse than the
1918 Spanish Flu, which killed 40 million to 50 million people. A larger, denser
global population, coupled with modern transportation systems of both goods and
people, could result in a pandemic killing far more people worldwide. The consequences
of such a pandemic would stretch beyond just public health. International
relations, commerce, politics, travel, medicine, and economic and social infrastructures
would be affected due to widespread infection and worldwide mitigation
efforts.
Europe. With their opium and ability to control the Suez canal. Opium war and such.