A young man comes before a customs agent

A young man comes before a customs agent.
A: "State your citizenship."
B:"American" (pronounced with a Spanish accent).
A: "Hold on there, buddy. Say that again."
B: "I sed American."
A: "I'm going to give you a test."
B: "No, no senor, no need for test, I tell you I"m American."
A: "Yeah, sure buddy. OK, let's see, ... I've got it. Make a sentence with the following colors: green, pink and yellow."
B: "Oh senor, I tell you I'm American. But OK, let's see... I was at my bruder-in-laws house and the phone went 'green, green, I pinked it up and sed yellow!"