Which of the following led to the growth of the meatpacking industry in the Midwest?
A. New techniques in killing cows
B. Cattle barges (ships)
C. Refrigerated (cold) railroad cars
D. New places to eat meat

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.

an era of negotiation.

is that an answer to your question?

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.