Because the cities are named by European immigrants naming places after their home towns. It not very original but I guess its better than naming it after yourself
Its more than just shade! Trees create extra cooling effect by using the suns energy and from the water evaporating from their leaves. Thats why you won't burn your feet on grass but an equally dark pavement burns your feet. Tree > umbrella in terms of heat mitigation.
All Rome leads to roads (lemmy.world)
[US] Feds spread $1 billion for tree plantings among US cities to reduce extreme heat and benefit health (apnews.com)