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Who: The Mexican American War was an armed conflict between the United States of America and the United Mexican State.
Where: The Mexican American War took place in Mexico and Texas.
What: Americans were reaching out beyond their borders to declare independence from Mexico.
When: This conflict between the U.S. of America and the United Mexican State was from 1846 to 1848. In June 1846 a group of American settlers seized the town of Sonoma. On February 2, 1848, the U.S. and Mexico signed the Treaty of Guadalupe Hidalgo.
How did it affect the U.S./world?
The Mexican American War affected the U.S. because it was the first nation's foreign war fought almost entirely of foreign territory. It also affected the U.S. because Mexican soldiers killed 11 U.S. soldiers. With that happening Congress approved war between them. The Mexican troops quickly gave way so this left the U.S. forces in control of California.

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Who Discovered it: Two Methodist missionaries by the names of Marcus and Narcissa Whitman discovered the trail that stretched from Independence, Missouri, to Oregon City, Oregon.
What was it? This is a trail used by emigrants to travel from Missouri to Oregon. Many who made used of it were motivated by the dreams of gold.
When: It began to function from 1811 to 1840 and it was only passable through the horseback and on foot.
How: The Oregon Trail was established by traders and fur trappers.
How did it affect the U.S.? The Oregon trail helped the United Sates grow by moving some of the population west from the overpopulated East. The people that migrated to the East, brought their culture and religious beliefs that eventually spread, where they settled.

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Who:  Lewis and Clark
What: Lewis searches by land for the Yellowstone River and rejoins Clark at the junction of the Missouri and Yellowstone River.
Where: Water route linking the Columbia and Missouri rivers and the  water link would connect the Pacific Ocean with the Mississippi River system.
How: By land and searching it.
How did this affect history of the U.S. &/or world?  What major change resulted? - This expedition impacted the United States because this help a lot of people move place to place.
The U.S.A. had just bought the Louisiana Purchase so they needed it to be mapped to get place to place.

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When: began at Sutter's Mill, near Coloma
Who:James W. Marshall, a foreman working for Sacramento pioneer John Sutter
How: found shiny metal in the tailrace of a lumber mill Marshall was building for Sutter on the American River.
Why: was working to build a water-powered sawmill owned by John Sutter
How did it affect the U.S./ world? It was one of the most significant events to shape American history during the first half of the 19th century. The discovery of gold revolutionized California's economy.

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Who: The Mormons were were a religious community that played a major role in the development of the West. They were found in 1827 by Joseph Smith in upstage New York.
What: The Mormons were escaping persecution.
Where: First, they moved to Ohio and then to Illinois.
When: In 1847, they stopped at the edge of the desert near the Great Salt Lake, in what it is now known as Utah.
How did this affect the U.S./world?
The Mormon Migration affect the world because they kept migrating from place to place and anti-Mormon mob's disliked their beliefs and practices so they murdered Joseph Smith.

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Who: President Jefferson purchased the territory, which extended from the Mississippi River west to the Rocky Mountains, from Napoleon Bonaparte.
When: This purchase took place on 1803.
How: Jefferson paid 15 million for this territory that more than doubled the size of the United States.
Why: President Jefferson had decided to purchase the territory because Napoleon had given up his plan of an American Empire and wanted to sell the Louisiana Territory to the United States.
How: did it affect the U.S.?
The Louisiana Purchase more than doubled the size of the U.S. and it also sent Meriwether Lewis and William Clark on an expedition to explore the territory. Their exploration brought forth valuable findings about the land.