Dramatic increases in global grain production since 1950 have been made possible by *
substantial increases in the amount of land under cultivation
global warming
an increase in the urban workforce
an increase in the agricultural workforce
.
an increase in the use of energy and technology

because he created electricity

hello,

the steamboat is your answer.

it seems like its the only form of transportation on the choices.

the united states broke it's neutrality was the constant german sinking of trading vessels resulting in the loss of lives, one example would be the lusitania.

there is not all the infomation needed to answer this question.   we need the who was going, or we need to know what islands you are talking about.