How did nationalism and riveries pushed europe toward war

When a nation depletes its natural resources, it often experiences rapid decline because it:

Which of the following statements about this graph is accurate? world grain production has increased in every year since 1950. the amount of grain grown between 1950 and 1980 decreased. world grain production has generally increased between 1950 and 2010. more grain was grown in 1950 than in any other year.

Which of the following inventions most directly allowed ancient farmers to produce a surplus ?