The whole land rose to resist foreign aggression.

举国奋起抗击略。

The whole nation is jubilant.

举国一片欢腾。

Up and down the country - Why not throughout the nation? Used when a politician needs to appear statesmanlike and non-partisan.

举国上下—-为什么不干脆说全国呢？政治家想要显得别重要、别有风度的时候酷爱此词。