According to the safety valve theory, what would happen when the American frontier was closed would be that the concept of what it meant to be an American would be changed by the influx of immigrants.
The safety valve theory emerged in the US with the Homestad Act of 1862, and its objective was to deal with unemployment due to the immigration concentration that occurred on the east coast of the country.
With the closing of the borders on the east coast, using the theory of the escape valve, there was a government incentive for immigration to the west of the country, where free land and work would be offered.
Therefore, according to the escape valve theory, the colonization of the West would alleviate the unemployment of the East. Through this influx of immigrants to the West came new American ideas of democracy and individualism, impacting the entire nation.
The alternatives to answer this question are as follows:
A. Economic growth would be halted because companies would have no new markets to conquer.
B. Social conflict would increase because citizens would have nowhere to start from scratch.
C. The country's population would quickly overwhelm its natural resources.
D. The concept of what it meant to be an American would be changed by the influx of immigrants.
The correct alternative is the letter D.
Learn more about Homestad Act here:
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The title of the map would be: "The states that made up the Italian Nation in the fifteenth century"
One of the distinctive features of the political organization in Italy was the importance of the city-states and in particular of the republics, which in the fifteenth century some had lost their independence, but not the Renaissance cities such as Florence and Venice. At the beginning of the fifteenth century the Italian territory was very fragmented in states of varying size and importance. The decline of the cities had led to a process of institutional strengthening, concluded with the establishment of signorie (the equivalent of the Iberian lordships), together with the oligarchic republics, founded previously.
Answer:
the improvement in knowledge about medicine
Explanation:
Mississippi -<span> Part of the longest river system in the United States, the Mississippi runs from Minnesota down to New Orleans, Louisiana, where it drains into the Gulf of Mexico. Along the way, the Mississippi drains part of 31 different states.</span>
Missouri -<span> The Missouri River merges with the Mississippi River near St. Louis, Missouri, after traveling eastward through Montana, and draining ten states.</span>
Colorado -<span> The Colorado River runs through the southwest, beginning in the Rocky Mountains, through the Grand Canyon, and finally flowing down into Mexico.</span>
Rio Grande -<span> One of the longest rivers on the continent, the Rio Grande flows from Colorado down to Texas, forming part of the US-Mexico border.</span>
Lakes
Great Lakes -<span> The Great Lakes are located in northeastern United States, along the border between the US and Canada. The collection of five lakes holds the record for the largest group of freshwater lakes in the world. The names of the Great Lakes are Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario.</span>
Great Salt Lake -<span> Utah's Great Salt Lake, with an area of 1,700 square miles, is the largest salt lake in the western hemisphere.</span>
