Write Relevant content
If people are clicking on it and linking to your site content. It means that your article has relevant content to the people for which they are searching. Successful article usually provide a deep dive into one topic and are written in language that is both simple and concise.
This means you should focus on a few topics that are most relevant to your audience. Write long form content and include images and graphics that will help guide the reader through your article. According to Google, nearly 75% of search queries in the United States come from mobile devices. So, it should not come as much of a surprise that the search engine heavily favors mobile sites rather than desktop site.
Make Your Site Mobile Friendly
Mobile Responsive websites on the other hand adjust the layout of the page depending on the device you are viewing on it. Mobile, tablet, desktop etc. If your site is neither mobile friendly nor responsive, you are going to have a really hard time in increasing your organic search traffic and page rank.
Resources like Page Speed Insights, GTmetrix and Pingdom will give you actionable steps to improve the load time of your website, while resources like the Google Search Console can help you identify and mobile usability issues. If you follow these steps you should be able to improve the mobile user experience on your websites and improve organic search traffic.
A keywords like America or United States of America or simply USA. Choose all the relevant keywords that are probable. These terms are usually more relevant to your audience and easier to rank your website. You might want to mention these terms a few times in your content and in your H1 tags as well.
I recommend using a few variations of the keyword since the exact phrase will not always flow well in sentences. Always remember that you are writing for an audience and not for a search engine. Because the most relevant your content will be there will be more traffic to your website.