[excellency]

Hello all,
I have a few problems with these sentences. They are all about grammatical points in English. I want you to find the incorrect underlined word and please tell me why it is not correct.
Thanks a million

1.Although fewer American work on farms today, they are too productive that the U.S is now the world’s top food exporter.
2.In 1829, James Smithson set aside money for creating of the Smithsonian institute.
3.Recognition for Herman Melville did not come until more than thirty years afterward his death in 1891.
4.In 1875, the American philosopher William James founded what was probable the world’s first psychology laboratory.
5.Wind erodes the land by picking up grains of sand and hurling it against rocks.
6.Limestone long has been quarried for to use as a building stone.