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<span>D. to fill the large need for workers on sugar plantations</span>
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in 1862 congressed passed the pacific railway act which authorized the construction of a trans continental railroad four of the five railroad were built with assistance from the federal government through land grants
The Native American Indians would lose land and their place because it states, ...”the Indians residing in any of the states or territories, and for their removal”...
Plants create oxygen for one, they also support the most basic organism which supply other more complex creatures. Plants survive on solar energy and CO2 released by animals.