Which of the following to spur growth in both the south and the west during the twentieth century?

a) regions’ stores of energy resources
b) irrigation
c) air conditioning
d) skyscraper

B) irrigation

Explanation:

The researchers understand the 19th and 20th centuries in terms of the growth because they were balanced by the local economies. Low-skilled workers supplied labor for industrialization, and higher-skilled helped spur innovations in agriculture and the manufacturing.

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