This cartoon shows the DC Colonist trying to enter the voting booth, but is told by Uncle Sam to go to the tax or selective service booths. The cartoon implies that the while District residents pay taxes & go to war for America, they are not permitted the sacred right to vote in U.S. elections. Thus DC residents fight & die in American wars and pay taxes to the Federal government, but at the same time, have no say who makes the decisions regarding taxation, war, and peace.
Source: Page 53 of “Our National Capital and its un-Americanized Americans” by Theodore Noyes