Point:
In 1929, the stock market crash happened in the USA. It provoked the shock
wave that reached Canada and caused the collapse of the country's economy.
Evidence #1 (from research):
The 1929 stock market crash often comes to mind first when people think about the Great Depression. The crash destroyed considerable wealth. Perhaps even more important, the crash sparked doubts about the health of the economy, which led consumers and firms to pull back on their spending, especially on big-ticket items like cars and appliances. However, as big as it was, the stock market crash led to a number of events that caused the Great Depression.
Evidence #2 (from research):
Some economists point a finger at protectionist trade policies and the collapse of international trade. The Smoot-Hawley tariffs of 1930 dramatically increased the cost of imported goods and led to retaliatory actions by the United States' major trading partners. Canada depends on the US for its imports and when the US imposed tariffs the Canada's economy suffered. Still, like the stock market crash, protectionist trade policies alone started to cause the Great Depression.