Which of the following events did not lead to the Spanish American war. A. French Emperor Napoleon III tried to gain control of Mexico
B. The United States became involved in conflicts between Cuba and Spain
C. Yellow journalism helped convince the public that the Spanish had blown up the warship USS Maine
D. Cuba was granted independence from Spain

Option A. French Emperor Napoleon III tried to gain control of Mexico  is the correct answer.

Explanation:

A is correct as Napoleon III ordered the withdrawal from Mexico in 1866, which means that he had nothing to with this war, that started at the end of 19th Century.

All other options led to the outbreak of war, as American newspapers (C) were reporting about the incident surrounding the warship USS Maine.

Question of Cuba( b, d) is the main reason why the war eventually broke out.

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

i think it was   tsar alexander ii