He would leave the fort on April fifteenth if the Confederates made no hostile act against Fort Sumter or against the United States flag.

VOA: special.2009.08.06

People in the United States seem quite familiar with Jamaican culture, especially with its flag.

美国人似乎很熟悉牙买加文化，尤其是牙买加的国旗。

来自牙买加 - SpeakingMax英语口语达人

The United States flag has fifty stars that represent the fifty states.

VOA: special.2010.04.02

The United States flag was raised over Alaska.

VOA: special.2010.02.11

Down came the United States flag.

VOA: special.2009.08.13

Johnny Cash imagines the many historical events the American flag has seen and experienced since the founding of the United States.

VOA: special.2010.07.02

The fifty star flag became the official flag of the United States on July fourth,nineteen sixty.

VOA: special.2010.04.02

That is the longest period in United States history that the flag has remained unchanged.

VOA: special.2010.04.02