Interactive US Map for WordPress
There are plenty of plugins that let you integrate maps from Google and other sites with WordPress. Take Interactive US Map for instance: it is a commercial plugin that adds a clickable map of all the states plus DC. You can insert it in your posts or pages with a simple shortcode. Webmasters can create multiple maps and use 3 of them at a time on their pages.
The Interactive US Map plugin comes with a visual editor, so you can change text or images that will be loaded without having to write a single line of code. This is a SVG based, mobile friendly solution. It resizes without any issues on mobile devices.