Originally posted by Holden McGroin 
So when one sings about Britannia ruling the waves, it's okay because it's a celebration of the domination of only 70% of the Earths surface, where the Nazis sang of total domination. 
 It isn't a celebratory song about dominion at all, its about having a kick arsed navy that DEFENDS against tyranny:
When Britain first at Heav'n's command 
Arose from out the azure main; 
This was the charter of the land, 
And guardian angels sang this strain; 
Rule, Britannia! Britannia, rule the waves: 
Britons never shall be slaves. 
The nations not so blest as thee, 
Shall in their turns to tyrants fall; 
While thou shalt flourish great and free, 
The dread and envy of them all. 
Rule, Britannia! Britannia, rule the waves: 
Britons never shall be slaves. 
Still more majestic shalt thou rise, 
More dreadful from each foreign stroke; 
As the loud blast that tears the skies, 
Serves but to root thy native oak. 
Rule, Britannia! Britannia, rule the waves: 
Britons never shall be slaves. 
Thee haughty tyrants ne'er shall tame, 
All their attempts to bend thee down 
Will but arouse thy generous flame; 
But work their woe, and thy renown. 
Rule, Britannia! Britannia, rule the waves: 
Britons never shall be slaves. 
To thee belongs the rural reign; 
Thy cities shall with commerce shine; 
All thine shall be the subject main, 
And every shore it circles thine. 
Rule, Britannia! Britannia, rule the waves: 
Britons never shall be slaves. 
The Muses, still with freedom found, 
Shall to thy happy coast repair; 
Blest Isle! With matchless beauty crowned, 
And manly hearts to guide the fair. 
Rule, Britannia! Britannia, rule the waves: 
Britons never shall be slaves.