Why would louis sign a constitution limiting his power

I think it would be because he didn't want to be too overpowered for the sake of it, also so the next in his spot wouldn't take things past the limit and cause damage to the area around. Hope this helps! :)

they made rome the dominant power in the mediterranean.

there are many ways of getting involved on your local party. attached you will find the brochure that describes some ideas: go ahead and visit your local hq, become a volunteer on your comnunity or struggle up for your own ideas so you can make them real.