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Gain on sale of the home last year will be reported on your US income tax return and be taxable in US. You will get a credit for the foreign tax that you paid in that country so to some extent you will not be taxed twice on this gain.
Money that you bring into the US from the sale will not be taxable.
Gain will be calculated as sale price less selling expenses less cost of the house less improvements, if any.
I presume this was not a rental property.