We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Many of the great salt marshes in the northeast US have been filled for development, mosquito (malaria) control, etc. On the southern US Atlantic coast, they still go on for miles.
Fresh water marshes tend to be transient but beavers are good at building new ones.
Salt or fresh, marshes are a paradise for many critters - local and migratory. I am most familiar with the salt marshes of Cape Cod, but have spent time in those of Georgia and South Carolina too.