Hi there,
Automated taxes using WooCommerce services will only calculate for the store’s home state, as _most_ stores only need to collect from customers within their state. We certainly aren’t tax experts, so if you aren’t sure where to collect sales tax, this site gives some pointers, while this one provides a nexus assessment. You may also want to reach out to a tax attorney, just to be safe.
If you do need to collect sales tax for each state, you have two options. First, you can use WooCommerce Avatax or the full TaxJar extension to automatically calculate taxes for each state.
Alternatively, you can manually enter tax rates into the tax table found at WooCommerce> Settings> Tax. We don’t have a tax table that can be uploaded, so these rates would need to be entered manually.
And then when I go to shipping options, no where is there a USPS drop down option.
The WooCommerce Shipping and Tax extension doesn’t add any USPS shipping methods; instead, it allows you print USPS labels from your WooCommerce dashboard. If you’re looking to show live USPS rates at checkout, you’ll want to look into the USPS Shipping Method extension.