By correct American spellings, I assume that you mean to spell things exactly like the French--with the letter U where it doesn't belong. Like in the word color, which sounds exactly like the word as it's pronounced--but for some reason, you insist on spelling colour which looks awfully similar to couleur if you ask me.
Which isn't surprising since the suffix -our is rooted in Old French, and the -or suffix is rooted in Latin.
I suppose if you like your language looking all French and fruity, then I guess that works for you--but it cracks me up to hear you pompous Brits performing Shakespeare in your silly accents--when Americans actually speak using the original (and some might argue, correct) pronunciations of certain words.
I know you think you're fancy speaking The Queen's English, but the English that we're speaking in America sounds far more similar to Elizabeth I (often regarded as one of your best Queens through the ages) or Shakespeare, than that snooty French nonsense you're speaking today.
Even the French on this side of the Atlantic is a truer, older form of French, because when everyone first arrived our languages forked into two distinct versions, due to the less frequent mixing back and forth. So, I'm sorry to say that your Old French spelling with an excessive number of silent U's is the linguistic equivalent of a duck billed platypus, kangaroo, or any number of ridiculous creatures that exist only in Australia.
I'm sure you might feel like your way is correct, because you had all those wars with France. I suppose that their close proximity has rubbed off on you, but as you can see (by checking my sources,) that you're the ones who changed things--not us. I'm sure that any number of engineering types on here can back me up on this point: as things go through various iterations, it's subtractive changes (which reduce complexity) that are far more desirable than additive changes (which increase complexity.) Unless of course you went to the Rube Goldberg School of Engineering!
I will concede on only one point, which is Zed--derived from the Old French (shocker) word Zede. In our defense, Zee is much better for rhyming with lyrics in the Alphabet song.