If there was a sudden, significant event in the area (such as a volcanic eruption) then a population with higher biodiversity is more likely to contain at least 1 species which will be adapted enough to survive in the changed environment than an area with lower species diversity.<span />
B)Railroads - more cities could access railroads and increase trade. was built more in the 1800s.Canals was a short-lived era. [ Railroads beginning in the late 1830s and early 1840s were built because they were faster and more reliable than Canals which were often destroyed by washouts of the banks and floods destroyed many canals. The first transcontinental was completed in 1869, by 1900 there<span>were 15 transcontinental railroads. ]</span>
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World leaders agreed to limit construction of large warships
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In late 19th century/early 20th century, the United States had become a global power with interests - and investments - around the globe. It was a new status and it had was symbolized by the victory in the Spanish-American War. The US was strong, modern and industrialized and it could support a powerful army and the powerful navy advocated by naval strategist Alfred Thayer Mahan. The "big stick diplomacy" meant that the US could impose its preferred outcomes abroad by military force if it wanted to. It translated into military interventions in the Caribbean to bring order in troubled nations and prevent European intervention, anathema to the Monroe Doctrine.
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Turnpikes made transportation of cotton from the North to the South faster. ... Railroads provided new job opportunities in the North for newly freed slaves from the South. D.) Canals and railroads linked the agriculture of the Midwest with populations in the East.
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