What is the primary mission of the united states

The U.S. Department of State advances the interests of the American people, their safety and economic prosperity, by leading America’s foreign policy through diplomacy, advocacy, and assistance. Every foreign policy decision by the President and the Secretary of State is made with the interests and protection of the American people in mind.

the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.