When did the Western Development of the United States begin and when did it end?

It should start in May 1830, and the end year may be 1860. You can take a look at the following information:\x0d\The western development of the United States is also called the Westward Expansion Movement. \x0d\ As early as the North American colonial period, westward immigration began. Slave owners in the South, land speculators in the North, and poor people all hoped to acquire land in the West. In order to confine the colonial people to places they could control, the British government issued a proclamation in 1763 prohibiting immigrants from crossing west of the Appalachian Mountains. The Revolution shattered this rule. In 1783, Britain and the United States reached a peace settlement, and Britain opened a large area of ??Indian-owned land from the Appalachian Mountains west to the Mississippi River to the United States. In May 1830, A. President Jackson passed the Indian Removal Act, moving Indians west of the Mississippi River. After this, troops were sent to escort the Indians out of the area east of the Mississippi River, and the colonial enterprise developed rapidly in this area. The land in the "Old Southwest" (including present-day Kentucky, Tennessee, Alabama, Missouri, Mississippi, Arkansas, and Louisiana) was mainly occupied by plantation slave owners and became a major producer of cotton. The colonial development of the "Old Northwest" (including present-day Ohio, Indiana, Illinois, Michigan, and Wisconsin) was due to the land ordinance passed in 1785 (sales of public land at low prices) and the "Northwestern Territory Ordinance" of 1787 And carried out rapidly. When the Revolution began, there were only a few thousand French people here. In 1810, there were more than 270,000 immigrants. In 1860, the number increased to 6.93 million. The population of Chicago alone was 1 million. This is an area rich in cereals and a developed farming industry. \x0d\At the same time, the United States also expanded west of the Mississippi River, annexing large areas of France, Spain, British colonies, and Mexico through purchases and wars. In 1803, while Napoleon was busy dealing with wars in Europe, the United States purchased a vast area called Louisiana (an area of ??about 830,000 square miles) from France for $15 million. The United States captured Florida from Spain in 1810 and 1819; in 1846, it forced the United Kingdom to make a treaty that extended the 49-degree northern latitude of the United States to the Pacific coast, excluding the British from this area. In 1846 and 1853, the United States launched wars with Mexico and purchased a large area of ??Mexico after victory, totaling approximately 950,000 square miles. By 1853, the United States had pushed its national borders to the Pacific coast, with a land area of ??3.03 million square miles (approximately 7.85 million square kilometers), more than seven times the territory when it declared independence. The population west of the Mississippi River was very sparse before 1840. Immigrants began to increase in the 1940s, especially the discovery of gold mines in California in 1848, which gave a major boost to the development of the west. After 1850, the immigration and economic development of this region played an important role in the development of the United States. In addition, the United States continued to expand westward into areas not contiguous with its homeland. In 1867, Alaska was purchased from Russia for US$7.2 million, an area equal to twice the size of the original 13 states of the United States. In 1894, the United States overthrew the King of Hawaii in Honolulu. After the Spanish-American War broke out in 1898, it annexed the Hawaiian Islands. \x0d\The territory of the United States continues to expand, attracting a flood of foreign immigrants. There were more than 5 million foreign immigrants from 1790 to 1860, and 27 million from 1861 to 1913. The population west of the Appalachian Mountains accounted for only 3% of the country's total population in 1790, but had grown to 49% in the 18th century. Immigrants from abroad have played a huge role in the development of the western region and the rapid development of the entire U.S. economy. Immigration enabled the United States to engage in large-scale agricultural production and develop its rich industrial resources with such force and scale that it soon destroyed Britain's industrial monopoly. The U.S. government's land policies and the construction of the transcontinental railroad accelerated the development of the West. The territorial expansion and development of the United States to the west had a significant impact on the political and economic life of the United States.

The vast western land was annexed to the United States, making the United States a vast country with rich natural resources and excellent natural conditions for economic development. It greatly expanded the area of ??cultivated land and was located in a climatic zone suitable for farming, which enabled the rapid development of agriculture. The development of the west led to the construction of large-scale railways and the inflow of a large number of immigrants, allowing the United States to form a vast domestic market. But it is undeniable that the westward expansion movement is also a history of blood and tears for American Indians.