1803 मायथायनि लुइसिफना बायनाय समाव आमेरिकाया आरकानसास दैमानि सा ओनसोल आरो रकि हाजोमानि सानजा ओनसोलखौ बायदोंमोन ।
The United States bought the area north of the Arkansas River and east of the Rocky Mountains in the Louisiana Purchase of 1803 .