title: create a google map of USA with long and lat columns and earnings
body: <p>I'm trying to create a map of USA with points of earnings by state.</p>
  
  <p>for example I have these data:</p>
  
  <pre><code>    state   capital_name     lat        long      women    earning            
  1   Alabama   Montgomery   32.36154  -86.27912     621       832    
  2    Alaska     Juneau     58.30194  -134.41974    797      1008 
  3    Arizona   Phoenix     33.44846  -112.07384    669       827  
  4    Arkansas Little Rock  34.73601  -92.33112     610       703  
  </code></pre>
  
  <p>For now this is my code:</p>
  
  <pre><code> mapPoints &lt;- ggmap(map) + 
                geom_point(aes(x = lat, y = long, size = sqrt(women_median_weekly_earnings)),   
                           data = join2, alpha = .5 ,color="darkred") +
                scale_size(range=c(3,20))
  
   map &lt;- get_map(location = 'usa', zoom = 4)
  
   mapPoints 
  </code></pre>
  
  <p>This what I get:
  <img src="https://i.stack.imgur.com/a8fJ9.jpg" alt="enter image description here"></p>
  
  <p>As you can see, the points are not on the map.
  What is wrong with the code?</p>
  
  <p>How can I fix it?</p>
  
  <p>Thank you very much</p>