Foreign policy involves the US working with other countries on economics and ideas. The president can make foreign policy by responding to foreign events or making policy statements. Congress can influence foreign policy through informal advice or legislative pressure. The Truman Doctrine pleaded with Congress to assist Greece and Turkey during a time of need, encouraging Americans to help other countries. NATO protects peace between the US and other nations, working in Afghanistan for many years. The UN and World Hunger Organization work to better conditions globally and assist in missions like those in Afghanistan. Foreign policy affects American citizens personally when soldiers fight abroad, worrying their families.