<span>transports first of all, to make trade easier: more highways, especially the one connecting to other countries. And new, bigger and more efficient airports, both for tourism and commerce. Oher structures that have been made more modern and functional are for example hotels, to guest more people.</span>
The answer would be the availability of new farming land in the west, while back east, most of their land had already been taken.
Because the Articles of Confederation where extremely weak forms of government and pretty much had to be scrapped before the constitution was written.