Why was Napoleon's skirmisher line not used in the American Civil War?

When the United States was founded, the thirteen States in North America were all British colonies. Therefore, the United States has always followed the British infantry tactics. In fact, due to the influence of the British Empire in the world, not only the United States, but also most countries in the world took the British line at that time. On the other hand, Europe's third-line tactics headed by frederick the great and the skirmisher tactics headed by Napoleon are not the mainstream in the world.

The three-line tactics are shooting in the front row, loading bullets in the back row, and then shooting in sequence, which requires extremely high military training and discipline and can only be implemented by European powers with highly organized troops at that time.

The skirmisher tactic is a large-scale scattered skirmisher line in front, followed by infantry from the rear brigade, and covered by a large number of artillery. After the skirmishers and artillery weakened the enemy's position, the infantry of the rear brigade carried out a surprise attack. This is a very advanced tactic, but it is only suitable for large-scale battles, so Napoleon is keen on defeating his opponents with decisive battles, because this can give full play to his advantages.

The two squadrons in Britain are very simple, tough and practical, typical of British style. Infantry are lined up in dense front and rear rows (sometimes crouching in the front row), and all of them shoot together when they enter the range. Large-scale battles are organized by a large number of independent squadrons of two platoons.

Therefore, it is not difficult to see that for the United States, which was underdeveloped at that time and even many people were keen on emigrating to Mexico, whether it was traditional or practical, the British double-line infantry tactics, rather than Napoleon's skirmisher tactics, were the most suitable for them.