The connection between those marques is that to all of the companies whose cars are shown above existed another American company that used the same marque and existed only in 1914. I can prove it at least for the already identified ones as well as for #2 which is a 1924 Cleveland and for #7 which is a Falcon 515. The 1914-only companies are:
1 - Bantam: Bantam Motor Co, Boston, Mass.
2 - Cleveland: Cleveland Cyclecar Co., Cleveland, Ohio
3 - Columbia: American Cyclecar Company, Seattle, Washington, which built a Columbia
4 - Continental: Continental Engine Manufacturing Co, Minneapolis, Minn.
5 - Davis: Davis Cyclecar Company, Detroit, Mich.
6 - Dodge: A.M.Dodge Co., Detroit, Mich.
7 - Falcon: Falcon Cyclecar Co., Cleveland, Ohio
10 - Mercury: Mercury Cyclecar Company, Detroit, Mich.
12 - Standard: Standard >Engineering Co., Chicago, Ill.