How can I do a grouping bar with the following data?

tidyverse
2

This is an example

library(ggplot2)

# Sample data on a copy/paste friendly format (replace this with your actual data frame)
sample_df <- data.frame(
  stringsAsFactors = FALSE,
           Country = c("US","US","US","US","US",
                       "UK","UK","UK","UK","UK"),
           Periods = c("Gold Standard 1881-1913",
                       "Interwar 1919-1938","Bretton Woods 1946-1970",
                       "Floating Exchange 1974-1989","Floating Exchange 1990-2019",
                       "Gold Standard 1881-1913","Interwar 1919-1938",
                       "Bretton Woods 1946-1970","Floating Exchange 1974-1989",
                       "Floating Exchange 1990-2019"),
             Value = c(0.3, -1.8, 2.4, 5.6, 2.4, 0.3, -1.5, 3.7, 9.4, 2.5)
)

# Relevant code
ggplot(sample_df, aes(x = Country, y = Value, fill = Periods)) +
    geom_col(position = "dodge")

Created on 2020-12-07 by the reprex package (v0.3.0.9001)

Note: Next time please provide a proper REPRoducible EXample (reprex) illustrating your issue.