Final answer:
The United Kingdom and France were responsible for the partitioning of Southwest Asia after the breakup of the Ottoman Empire.
Step-by-step explanation:
The two European countries responsible for the partitioning of Southwest Asia after the breakup of the Ottoman Empire were United Kingdom and France. In 1916, the Sykes-Picot Agreement, a covert deal made between Britain and France with the approval of Italy and Russia, divided the Middle East under their spheres of influence. France gained control over areas that are today Lebanon, Syria, and northern Iraq, while Britain gained control over regions that include Jordan, Kuwait, and southern Iraq. The two countries also shared control of Palestine.