The Middle colonies had some slaves while the New England colonies had very few slaves. This is true because there was more large scale farming in the southern part of the Middle colonies where the soil was more fertile and the climate more suited for farming. Thus, another difference is the kind of farming done.
I think it's called the cape of good hope is at the bottom of south america and it's notorious for being rough so when they put the erie canal in it made trade safer and a lot faster hope this is what you were looking for.
Some of the deeper issues that caused tension between the United States of America (USA) and the Union of Soviet Socialist Republics (USSR) were that the USA was committed to capitalism and democratic institutions of government, whereas the USSR was committed to communism and imposed authoritarian government. The Cold War was mostly a tension between these worldviews.
There were also immediate conflicts and pressure points as the Cold War began in the late 1940s (after World War II). One of those issues was that the USA had atomic weapons and the USSR did not. (The US would not share that technology with the Soviets, who had been their ally in World War II.) When the Soviets developed their own atomic weaponry, this led to a massive arms race between the superpowers -- which brought significantly more tension to the situation. Further tensions developed over which nations would be aligned with each of the superpowers -- either with the USSR and communism and with the USA and its democratic, capitalistic worldview.
They wanted a Bill of Rights because they thought it was absolutely necessary so that the government could never endanger the liberties/rights of the people. For example you've got your things like "Freedom of Speech" in the Bill of Rights to prevent the government from silencing our criticism and political ideas thanks to this. This is what I mean about Anti-Federalists wanting to protect individual freedoms.
In the 20th century we had a massive increase in population living in the cities which in turn urbanized cities everywhere. Giant skyscrapers began building everywhere and cities began growing and expanding.