Because people have become bigger themselves.
In the 50's, 60's and 70's cars were bigger than they are now.
It is also a selling, point. People think more is better, but in this case it isn't. Hurts emissions and fuel economy, parking and traffic to an extent.
A big yes. Without cars nowadays people will experience some difficulties in reaching an important place in only a short of time.
They have more protection.
most of the cars nowadays have air conditioning ........
The body/chassis mostly the same on most cars nowadays.
yes, for sure. hydrogen cars are created today.
Usually by turning the key (but alot of cars nowadays dont have a key anymore so u can push the "start-button"
To keep the cost and the weight down.
In Canada it is 500hp. Anything over that is technically illegal. But nowadays alot of cars come factory tuned over 500hp, so those are legal.
When radios appeared in cars it was wartime. The purpose was so that people could listen to news broadcasts about the war while travelling. Nowadays we use them for news updates and personal entertainment (music).
Of similar sizes, but different shapes, to cars today. Not so many 'mini' style cars in the 1940s.
Small cars are better because big cars are to heavy
No, new cars nowadays do not have cassette players. Most new cars have CD players and radio. It will be possible to customize your car and add an cassette player, but there are no new models so you have to usen an used one.