Simplify the following text for a Grade 8 native English-speaking person.
Original: The next year , on May 2 , 1890 , Congress passed the Oklahoma Organic Act , which organized the western half of Indian Territory into Oklahoma Territory .
Simplified: Oklahoma Territory was an organized territory of the United States from May 2 , 1890 until November 16 , 1907 , when Oklahoma became the 46th state . It was made up of the western area of what is now the state of Oklahoma .