The united states as a world power in room and open door policy
Americans had always sought to expand the size of there nation and throughout the 19th century they extended their control westward
united states should join imperialist power of Europe and establish colonies over seas to stronger nations
advances in technology enabled farms and factories to produce far more than americans citzens could consume
promoting ecnomic growth going the late 1800americans simply could not consume all of the food and other goods that their nation produced .
eserving american spirit a third force for expansion consited of people who feared that u.s. was changing. By the 1890s westward expansion was basically finshed.