Who were at war in the early 1800s?

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The United States fought four wars in the 1800s: the War of 1812, the Mexican-American War, the Civil War, and the Spanish-American War. The United States fought Mexico in the Mexican-American War from 1846 to 1848. The United States wanted to expand west.

Explanation:

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18011807Temne WarBritish Empire Susu Tribes

18011805First Barbary WarUnited States Sweden (until 1802)

18011801War of the OrangesFrance Spain

18021805Fourth quarter of the

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question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals