Thats a complete fantasy, your idea that the standing Army was expanded after the war of 1812.
We started with one regiment in the 1790s. That was soon expanded to a total of 13. (interesting number,,,isn’t it?)
In the war of 1812 we expanded to 50 regiments.
In 1815 it was reduced to a 8, lower than the prewar total. In 1821 it was reduced even further to 7.
And the importance of a Navy was well understood, and it was commissioned and steadily grew. It was only limited by finances early on. By the civil war the navy was very powerful. That’s simply unsupportable that we had no effective navy before T. Roosevelt.
And in any case, despite the thread hijack, the argument was that America was not built upon the idea of worldwide intervention on a continuous basis like the Romans, or Brits had to. They were in almost constant military action and were intervening in nations far from home, and dictating their governments.
As fun as that is, it destroys freedom at home, bankrupts the treasury, and creates enmity worldwide. It is doing so with us, and the neocons love every minute of it. Some conservatives do too because they confuse supporting our military, with needing to champion its near constant use worldwide.