In Colorado, we frequently see the phrase 'Centennial State.' It is on our license plates, tourist brochures, and even on Colorado's statehood commemorative stamps. Where does this phrase come from, and what does it mean?

The simplest explanation has to do with America's 100th birthday in 1876. Let's find out what a centennial state is, and why Colorado is called one.

When Did Colorado Become a State?

Colorado State Capitol
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Read More: Discover Colorado's Rich History And Symbolism In Its State Seal 

100 years passed between the signing of America’s Declaration of Independence (1776) and Colorado’s recognition as the 38th state on August 1, 1876. A 100th anniversary is often called the centennial anniversary. Since Colorado became a state during America’s centennial anniversary, it was quickly given the nickname ‘centennial state.’ Colorado joined the Union following the signing of the proclamation by President Ulysses S. Grant.

Did It Take 100 Years to Become a State?

Colorado State seal, Colorado house chamber
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Some Coloradans joke that the "Centennial State" nickname came from the long wait between becoming a territory in 1861 and statehood in 1876. Boom-and-bust mining made it hard to get solid population numbers across Colorado’s rugged terrain, slowing progress. Political fights over boundaries, governance, and even where to put the capital didn’t help.

Coloradans even voted down proposed state constitutions in 1864 and 1865. In the end, America’s 100th birthday might have been the only thing strong enough to push Colorado across the finish line.

Celebrating the Centennial State On Colorado Day

Today, Colorado’s Centennial nickname is a part of our schools and businesses around the state. The town of Centennial, Colorado, was named just that, to reflect our independence and pioneer spirit. We celebrate this spirit every year on Colorado Day (August 1st).

This year, Grand Junction’s Back to School Splash Party at the Lincoln Park Pool happens on Colorado Day (Friday, August 1st). The following Monday (August 4th), State Parks around Colorado will allow guests to waive the cost of admission in celebration of our state.

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Snow at the capital
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LOOK: The History of Welcome Signs in the Centennial State

Colorado is surrounded by seven neighboring states with multiple highways that will lead you in and out from all sides. More than 40 Welcome to Colorful Colorado road signs are waiting to greet visitors. Scroll on to find out where they are and to get a glimpse of each of them.

Gallery Credit: Wes Adams

MORE: How Does Colorado's Oldest Town Compare To Neighboring States?

How old is the first town established in Colorado compared to the very first towns established in our neighboring states? Can you guess which 'first town' is the oldest?

Gallery Credit: Wesley Adams

NEXT: 24 Reasons We Love Calling Grand Junction, Colorado Home

Grand Junction, Colorado, is the largest city on the state's Western Slope. There isn't another large city for 200 miles in any direction, making it one of the most unique places you can live in Colorado. In the gallery below, we asked you to tell us one reason you love calling Grand Junction home.

Gallery Credit: Wesley Adams

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