Garcia's tally put the icing on the cake for the Dynamo, who entered the second leg of the Eastern Conference Finals with a 3-1 lead and ended the aggregate-goal series with a 4-2 advantage.
The result ensured the Dynamo's second trip to the championship final in two years -- they fell to Los Angeles in the 2011 MLS Cup -- and wrapped up their fourth conference championship in seven seasons.
Branko Boskovic scored in the 82nd minute for second-seeded D.C. United.
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