Most of the immigrants to the united states from the mid-1990s to the present day have come from- a) eastern europe. b) western africa. c) areas of natural disaster. d) areas of political or economic strife.

D. Areas of political or economic strife.

Areas of political or Economic strife  ( D )

Explanation:

The main Reasons most immigrants come to America is for better Economic opportunities like to get good jobs and also good standard of living, many others come because of freedom from political crisis that prevents them from living freely and practicing their various religion and other personal habits.  

The countries with the highest number of immigrants in America are countries with either a very poor economy or in a very bad political tensions like most African( not just western Africa ) and Asian countries where poverty is very high and the political tensions are high contributes to most of the immigrants in AMERICA. the country with the highest immigrates in America in present day is Mexico which is in North America.

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crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.