A large supply of cheap labor ....
In 1821, William Becknell led a wagon train from Independence, Missouri, to Santa Fe, New Mexico. The wagon train led by William Becknell then established a <span> route for international trade with Mexico.</span>
The precedent that Washington and Congress made was to have cabinet meetings with their top advisers.
Hope this helps!
-Payshence
The era of good feelings was from 1815 to 1825 because the Napoleonic wars ended
i hope this helps if so please mark brainliest