What did President Hoover think caused the great depression?

Hoover blamed the Depression on foreign economic collapse over which he had no control. Major European banks went bankrupt, causing alarm in other foreign banks. Great Britain went off the gold standard. The Bank of England no longer redeemed its paper money in gold bullion or coin. Investors feared that all paper money would lose its value so they withdrew $1.5 billion in gold from American banks. This further weakened the global economic situation.