Economics played a major factor in Manifest Destiny, the west held vast amounts of goods some which had never been seen on the trade market before. The expansion west open many new trading routes and partnerships increasing the US’s international economic growth. The later years of expansion brought the gold rush which was another huge economical boost for The US.
This is one of the biggest factors of Manifest Destiny, because the underlining idea of it was relocating Native Tribes west and taking their lands for US settlers. Tribes were moved thousands of miles in order to fulfill “God’s Plan”
Another geographical factor was the Rocky Mountains, which slowed down the expansion westward for settlers, until miners blasted through the mountain
The United States government gained a lot of assets through Manifest Destiny. It is not suprising why they backed it and encouraged westward expansion, especially Andrew Jackson, who put in place The Indian Removal Act of 1830