This cartoon appeared in 1916. the topic of the cartoon isa)the reason for the start of world war i. b)the success of us submarines in world war i. c)the military alliance between germany and mexico. d)the attitude in the us towards submarine warfare in world 

The right answer is D the attitude in the US towards submarine warfare in World War I. In 1915 a German submarine attacked a RMS which transported British and American citizens sinking it almost immediately. Owe to this, there were 128 dead American people. Wilson, the American president by then, did not declare war on Germany keeping on with the neutrality but warn if the Germans violated American people rights again, he for sure would declare war, what happened in 1917.  

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