You may have been taxed on complete net income when you were in the U.S. because a flat 30% tax is imposed on U.S. source capital gains in the hands of nonresident alien individuals physically present in the United States for 183 days or more during the taxable year.
Capital gains are not taxable to the U.S. to a nonresident not living in the U.S.
Some or all of your dividends may be taxable. U.S. dividends are taxable if paid by a U.S. company or by a foreign corporation if at least 25% of the corporation's gross income is effectively connected with a U.S. trade or business for the 3 tax years before the year in which the dividends are declared.
Investopedia has a good explanation of what is taxable to nonresidents living outside the U.S. See Do Non-U.S. Citizens Pay Taxes on Money Earned Through a U.S. Internet Broker?
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