One historian writes that the Code of Hammurabi was the most important source of modern law. Another historian argues that modern law is based on the legal system of the Roman Republic. What could be the reason for the difference of opinion between these experts?

one historian did not examine primary sources

one of the historians' research has serious flaws

they used different secondary sources for research

their interpretations of historical facts vary

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.

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.