Because the unilateral system is easier to get as close to the dimension the engineer specified.
Bilateral tolerancing (also known as symmetric tolerancing) is a method of tolerancing a dimension using equal plus and minus deviations from the nominal dimension.
Unilateral tolerances (also known as asymmetric tolerances) on the other hand specify a deviation in only one direction, either plus or minus, from the specified nominal dimension. Unilateral tolerances may also take the form of plus and plus-plus, minus and minus-minus, or plus or minus some amount and plus or minus a lesser amount.
The answer is iron. The Hittites learned to smelt and work with the element before any other civilization.
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The Senate maintains several powers to itself: It ratifies treaties by a two-thirds supermajority vote and confirms the appointments of the President by a majority vote. The consent of the House of Representatives is also necessary for the ratification of trade agreements and the confirmation of the Vice President.
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The North American fur trade, an aspect of the international fur trade, was the acquisition, trade, exchange, and sale of animal furs in North America. Aboriginal peoples and Native Americans of various regions of the present-day countries of Canada and the United States traded among themselves in the pre–Columbian Era. Europeans participated in the trade from the time of their arrival to Turtle Island, commonly referenced as the New World, extending the trade's reach to Europe. The French started trading in the 16th century, the English established trading posts on Hudson Bay in present-day Canada during the 17th century, while the Dutch had trade by the same time in New Netherland. The North American fur trade reached its peak of economic importance in the 19th century, and involved the development of elaborate trade-networks.
The fur trade became one of the main economic ventures in North America, attracting competition among the French, British, Dutch, Spanish, Swedes and Russians. Indeed, in the early history of the United States, capitalizing on this trade, and removing the British stranglehold over it, was seen[by whom?] as a major economic objective. Many Native American societies across the continent came to depend on the fur trade[when?] as their primary source of income. By the mid-1800s changing fashions in Europe brought about a collapse in fur prices. The American Fur Company and some other companies failed. Many Native communities were plunged into long-term poverty and consequently lost much of the political influence they once had.
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