This map shows David Thompson’s journeys through North America. Thompson’s main contribution to the development of the Pacific Northwest was to

show fur traders the quickest route out of Canada.

find the shortest route from the East Coast to Washington.

explore the region, helping fur companies learn about it.

discover that the Columbia River empties into Hudson Bay.

what are local authorities doing to fix the problem

explanation: what are local authorities doing to fix the problem

yellow fever and other tropical diseases

austria

hugary

yugoslavia

czechoslovakia

a causal relation between two events exists if the occurrence of the first causes the other. the first event is called the cause and the second event is called the effect. a correlation between two variables does not imply causation.

explanation: