The phrasing of the question implies that the land bridge between Asia and North America was something formed with intention. This is not the case. The land bridge was simply a part of land that was exposed by the receding waters around the world in the last Ice Ages.
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Its existence made possible the transference of a number of creatures from North America and Asia to the opposite continent. For example, horses, which had evolved exclusively on North America, were able to cross over to Asia, where they became more dominant (especially after they became extinct in North America). Conversely, humans, which came from Asia, were able to settle in the Americas.
