If you mean the United States, the black widow spider. Others are the brown recluse, and the less well known hobo spider.
It is the Black widow spider
The least deadliest spider is The Daddy Long Legs Spider.
The Brazilian Wandering spider is from Brazil.
the tarantula
Brown recluse
Spider Wasp
Black widow
The deadliest spider in Australia is the Red Back spider, closely followed by the Funnel web spider.
The banana spider is not the most venomous spider. It is only mildly toxic to humans.
spider hunting wasp
one you can't cure.
Brown recluse