title: How to zoom in to the north east area of US in R (ggplot/ggmap) with limit (xlim and ylim)?
body: <p>I was working on a project where I want to use ggplot or ggmap to show 'only' the northeast part of the US (we can use NYC as our center).</p>
  
  <p>I locate the x and y of NY state and want to create the range for both axis +/- 10 degree, but did not know how to make the ggmap only shows the area i want it to show. I kept getting either the whole map or only a point...please help...thank you!!!</p>
  
  <pre><code>which(usa1$stateName == "new york")
  ny.x = usa1$x[which(usa1$stateName=="new york")]
  ny.y = usa1$y[which(usa1$stateName=="new york")]
  ny.x1 = xlim(ny.x -10, ny.x+10)
  ny.y1 = ylim(ny.y -10, ny.y+10)
  
  us.map.zm &lt;- ggplot(usa1, aes(map_id = stateName))
  us.map.zm &lt;- us.map.zm + geom_map(map =usa, aes(fill = usa1$Murder),fill="white",color ="black") + ylim(ny.y-10, ny.y+10) + xlim(ny.x-10,ny.x+10)
  us.map.zm &lt;- us.map.zm + geom_point(data=usa1,aes(x = usa1$x, y = usa1$y,size=usa1$POP17, color="blue"))
  us.map.zm &lt;- us.map.zm + coord_map() + ggtitle("Northeast US Populaton vs Murder rate")
  us.map.zm
  </code></pre>