What does Karl Marx mean when he says “all that is solid melts into air”?

What does Karl Marx mean when he says “all that is solid melts into air”? show a good grasp of the Manifesto and do a nice job using quotes to support your claims. But I do not see a thesis. As a result, your line of thought is hard to follow. You get a bit lost in the details. I would also like to see you simplify your writing. Break down complex ideas. Use short, direct sentences. Concentrate on topic sentences and logical development.