Because they weren't as Agriculturally based as the Southern colonies were.
Modern production methods,consolidation,labor unions
It gained political and security benefits.
A second prosecution for the same offense after acquittal or conviction or multiple punishments for the same offense. The evil sought to be avoided by prohibiting double jeopardy<span> is </span>double<span> trial and </span>double conviction, not necessarily double<span> punishment.</span>