When the Federal Trade Commission allowed the two largest oil companies, Exxon and Mobil, to merge, it created the world's largest company. In order to complete the merger, Exxon and Mobil agreed to sell 2,431 gas stations. Of them, 1,740 were located in the mid-Atlantic states, 360 in California, 319 in Texas, and 12 in Guam. Why would government regulators require Exxon-Mobil to divest themselves of so many gas stations in specific parts of the country before allowing the merger to occur?