Why are some national contests invalid in certain states and other countries?

The first place winners from each station are sent to the national contest later in the year.

It has now evolved to the point where national contests are held.

Its students have won numerous prizes in such international and national contests.

At age 15, Miller won a national contest for student editorial writing.

Letters about Literature is national contest for grades 4 through 12.

The national contest has gained much coverage by the press and television media.

In Latvia a national contest open to all high school students takes place each year.

In 2012, the strings program won gold at a national contest.

A national contest might provide some good ideas about the best use of melted guns.