Our share of night to bear — United States

Our share of night to bear－1
Our share of morning－
Our blank in bliss to fill
Our blank in scorning－

Here a star, and there a star, 5
Some lose their way!
Here a mist, and there a mist,
Afterwards－Day!
(F.116/J.113)
[1, 2] Our share, night, morning:: the Independence of America.
[3] blank, bliss:: the New World with blessing.
[4] blank, scorning:: the field with slaves.
[5] star:: a state, in the national flag since 1777.
[7] mist:: obscurity, dimness.
[8] Day:: day of battle (OED 10).