Smile though your heart is aching Smile even though it's breaking
When there are clouds in the sky
You'll get by
If you smile
Through your fear and sorrow
Smile and maybe tomorrow
You'll see the sun come shining through for you
Light up your face with gladness
Hide every trace of sadness
Althought a tear may be ever so near
That's the time
You must keep on trying
Smile, what's the use of crying
You'll find that life is still worth while
If you just smile :)

a.Cheyenne

Explanation:

Despite the invasion of George Armstrong Custer in 1868 on Cheyenne nation. The people of Cheyenne were originally peaceful about the whole issue.

However, around 1874 to 1875, they were involved in the widespread results of the southern Plains tribe.

As a result, the Cheyenne nation got involved in a larger battle that defeats Custer. The battle was known as the Battle of the Little Bighorn.

Hence, in this case, the correct answer is CHEYENNE.