Yankees
There nickname was the Yankees.
The Union Jack is the nickname of the UK flag.
The nickname for the British flag is the Union Jack. Although it is only correctly known as this when flown on a ship.
During WWII the US gave the nickname "The Red Tide" to the Soviet Union.
The Union.
It's common nickname is the 'Union Jack'.
The union of the states
The nickname for the eastern states of the United States is often referred to as the "East Coast."
The thistle's
The Union Jack - properly known as the Union Flag.
The nickname of the United States is US or USA.
On August 2, 1876, 28 days after the Centennial of the United States, US President Ulysses S Grant signed a proclamation admitting the State of Colorado to the Union as the 38th State and earning it the nickname - Centennial State.