The oregon country was a home for native americans and the u.s and britain and it was a reigion west from the rocky mountains.Mountain men were people that trapped animals and Made prophets and more,they also spent winters in native american villages,they also set west to lead the mountains to oregon 
Mexican-American war
The mexicans are here
there what are here
The oregon trail was people going to oregon and all the harsh things they had to live through,like the cold and more,the terrain was rough and they got sick because of native americans.They traded with the native americans and they stated at missouri and went to oregon it took them 20 years and 50,000 americans reached oregon
Mormons in Utah
It was people believing in god that they were going to make it and also they were going to thrive with god.It was used to justify the native americans who had been living on our land and thats how it was also used.
California gold rush
The annex with texas was declined by the us because the senat was scared of mexico because they had more power and the U.S was scared.Then the U.S troops colidid with mexica troops and then thats where the war began and it was in a disputed area.The mexican-american war ended in a treaty and it was called the Treaty Guadalupa Hidalgo and it gave the U.S california and other states preety much the whole west.
there what
The americans are here
Mormons were people of the church for jesus christ of latter-day saints,which was founded by Joseph smith in 1830.IT allowed men to have more then one wife,Then joseph smith died from a mob in illinoi 1844,then bringham young becomes mormon leader,bringham becomes govener of utah and took land from native americans.
We believe in you jesus 
The california gold rush is what the Called Gold rush now a days was a fight over gold in california.There was 80,000k of people trying to find gold and they would fight over the spots that there was,they also did kill each other to get gold.There was people from south america,Europe,The whole u.s,Ect but only some people got gold and some just got houses in california.