Explain why oil is so important to these countries, US, Saudi Arabia, Russia, Canada, China, Iraq.

The United States' dependence on oil has long influenced its foreign policy. This timeline traces the story of U.S. oil development, and the resulting geopolitical competition and environmental concerns, in more than forty milestones. The three major periods include the rise of oil as a commodity, beginning in 1850; the post-WWII age of geopolitical competition; and the current era of deregulation and diversification.

an effect of the steamboat's popularity was that people began building canals in the united states and europe. this was done to find another way to transport goods across the country and in that time, transportation using the river was very slow and dangerous. it depended entirely on manpower and the current of the river. that all changed in the late 1700's when steamboats were introduced. they soon revolutionized travel and trade through the river and dominated the waterways. eventually, other means of transportation took over from the steamboats, but there was a time that they the united states to expand to the west.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.