It usually is on a side or at the bottom. It is usually standard to put data sources and dates, map construction data, and yor name on maps. For lab assignments using lab data, a data source note is not needed. The standard bar chart has vertical bars, but horizontal bars can be valid and useful. Some of the end countries and even the bar legend may be cut off on the right end.
Bars are horizontal.
Apparently it is more stable and likely to work on the map. It can be stretched length-wise until all of the countries appear. Consider repositioning the small chart legend in the chart. While in Chart, click on the legend and a Chart Legend Properties box will appear.