Aus marine barracks in beirut was targeted by terrorists in 1983 because the united states supported iraq in a war with iran. the unites states did not sanction israel for invading lebanon. the united states had backed an unpopular leader in iran. the united states had tried to destroy the plo.

The correct answer is: Because the United States supported Iraq in a war with Iran.

On June 6, 1982, the Israel Defense Forces invaded Lebanon with the support of the United States of America, this country provided military support to Israel in the form of weapons and materiel.

As a consequence, on October 23, 1983, two truck bombs hit buildings in Beirut. A group called Islamic Jihad claimed the responsibility for the attacks and said the objective was to force Multinational Force out of Lebanon.