State two methods used by the united state’s government to acquire new territory

When the American Revolution formally concluded with the 1783 Treaty of Paris, Great Britain ceded the region of the thirteen original territories to the new country of the U.S.A

Explanation:

American Samoa was procured below the 1899 Treaty of Berlin within  Great Britain, Germany and the United States of America. the last major purchase in the Northern part of  America was bought from a Russian country in 1867. Requests for development into Territories of Spanish like Cuba began to the War of America and Spain, in which the U.S obtained, Puerto Rico, Philippines, and Guam and conquered Cuba for numerous years.

food chain i would say only because there is competition on getting food and survival

answer:   migrations were important in the neolithic period. "two major migrations passing through southeastern europe were confirmed by the means of archaeo-genetic studies."

the first migration was the early neolithic period -- 6,000 before common era (bce) -- when the first farmers, from anatolia -- asia minor -- spread through europe. the second migration occurred during the early bronze age (3,000-2,500 bce) when the so-called "steppe population," from the eurasian steppe, replaced much of northern europe's previous population.

the first farmers of northern and western europe passed through southeastern europe with limited hunter-gatherer genetic admixture, which occurs when two or more previously isolated populations begin interbreeding. however, some groups that remained mixed extensively -- without the male-biased, hunter-gatherer admixture that prevailed later in the north and west, according to latest discoveries. southeastern europe continued to be a nexus between east and west, with intermittent genetic contact with the steppe people up to 2,000 years before the migrations that replaced much of northern europe's population.

"in some places, hunter-gatherers and incoming farmers seem to have mixed very quickly," says iain mathieson, a geneticist at the university of pennsylvania, who was first author of the paper. "but, mostly, the two groups remained isolated, at least for the first few hundred years. these hunter-gatherers had been living there for thousands of years, and it must have been quite a shock to have these new people show up -- with a completely different lifestyle and appearance."