I paid over $700 in foreign taxes on ETFs. Why do I only get credit for $37?

In 2016 I paid over $700 in foreign taxes on 'Dividends and Distributions' listed on my 1099-DIV. These were from ETFs with Schwab and Vanguard. The 'Deductions & Credits' in turbo tax says I get $37 in credit for Foreign Taxes. Why don't I get credit for all?