A bill of rights is necessary to protect the rights of individuals.
The national government holds too much power over the states.
The distribution of powers provides a safeguard against excessive government power.
A general rule of thumb is that Anti-Federalists wanted all of the power in the hands of the people and states. They hated the idea of a federal government (thus Anti-Federalist)
the invention of the smart phone has drastically changed the way we go about our lives today, making us able to access anything on the internet, whereas 25 years ago, nobody could've imagined the possibilities.