Unfortunately, EVs in the United States are prioritized for range now and range is a function of battery size, with a corresponding penalty of cost and weight.
There are still a few EVs models available in the US that are relatively light compared to the mainstream models, and most are going to be old/used models.
e.g. Nissan Leaf, Chevy Bolt, Fiat 500E, BMW i3, Volkswagen eGolf.
None of the above will be in the low 2000 lbs curb weight territory that is part of the Miata driving feel, but they are the closest you can practically find.
There are still a few EVs models available in the US that are relatively light compared to the mainstream models, and most are going to be old/used models.
e.g. Nissan Leaf, Chevy Bolt, Fiat 500E, BMW i3, Volkswagen eGolf.
None of the above will be in the low 2000 lbs curb weight territory that is part of the Miata driving feel, but they are the closest you can practically find.