How did domesticating plants help the people of the Neolithic era domesticate animals? By domesticating plants, people could barter for domesticated animals.

Domesticated plants were used to attract animals that could be domesticated.

By domesticating plants, people could spend less time gathering wild plants for food.
Domesticated plants provided a reliable food supply to feed the domesticated animals.

About the same time they domesticated plants, people in Mesopotamia began to tame animals for meat, milk, and hides. Later, people began domesticating larger animals, such as oxen or horses, for plowing and transportation. These are known as beasts of burden. Domesticating animals can be difficult work.

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the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

the answer should be monarchy