A timeline is a diagram in which the events that happened in a certain period of time are established, in the chronological order in which they happened, thus showing a well-defined sequence between them. In other words, the timeline is a visual representation of a chronological sequence.
The bar graph, on the other hand, is a graph, a diagram that establishes the comparison between two or more elements. This type of graph is a representation, where each bar represents, in this case, the population in each of the regions. Each bar is placed next to each other so that the comparison between them can be made.
