The most accurate statement that differentiates between a world issue currently affecting U.S. foreign policy and a world issue that affected U.S. foreign policy in the past is:
Health care currently affects U.S. foreign policy, while apartheid affected U.S. foreign policy in the past.
This statement highlights a contemporary issue (health care) influencing U.S. foreign policy and contrasts it with a historical issue (apartheid) that shaped past policy decisions.