USA HISTORY

Detailed explanation-1: -Throughout the early 1800s, state governments had already begun to sign treaties that forced various Native American tribes to give up their homelands. On May 28, 1830, President Andrew Jackson centralized and sped up the process by signing the Indian Removal Act.

Detailed explanation-2: -This portion became the Territory of Oklahoma in 1890 and eventually encompassed all the lands ceded in 1866. The two territories were united and admitted to the Union as the state of Oklahoma in 1907.

Detailed explanation-3: -The greatest impetus for Oklahoma statehood began after the Land Run of 1889. Approximately fifty thousand non-Indian settlers made the run on April 22, 1889, into the Unassigned Lands (Oklahoma District). They began immediately to clamor for statehood in order to gain representation in Congress.

Detailed explanation-4: -The growth of railroads brought more white settlers west of the Mississippi. As the U.S. population swelled, Congress opened large swathes of the territory for settlement. By the early 20th century, Indian Territory had been abolished.

Detailed explanation-5: -Between the 1830 Indian Removal Act and 1850, the U.S. government used forced treaties and/or U.S. Army action to move about 100, 000 American Indians living east of the Mississippi River, westward to Indian Territory in what is now Oklahoma.