According to the excerpt from the "Four Freedoms" speech, why is national unity critical for the present situation?

using the map image above, answer a, b, and c. a. briefly explain the historical context of this map image.b. briefly explain one economic or social development in the period 1607–1754 that could be used to explain what the cartographer (mapmaker) shows in the map image. c. briefly explain one social development in the period 1607–1754 that could be used to explain the distinctions shown in the map image.your responses: a.during this time period the colonies had recently been formed by the british. the colonies were grouped into three sections based on common beliefs, lively hood, and how they interacted. the new england colonies had passed the mayflower compact and they focused on trade, shipbuilding, and fishing. the middle colonies had purchased land from the native americans and dealt mostly with the export of wheat, banking, and shipping.

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because mexico wanted to choose a centralized location

the answer would be:

b. race

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."