title: How to modify points drawn on map using a dropdown menu?
body: <p>Here's how I create the map and add a dropdown menu with option1 and option2.</p>
  <pre><code>import pandas as pd
  import plotly.express as px
  
  us_cities = pd.read_csv(
      'https://raw.githubusercontent.com/plotly/datasets/master/us-cities-top-1k.csv'
  )
  
  
  fig = px.scatter_mapbox(
      us_cities,
      lat='lat',
      lon='lon',
      hover_name='City',
      hover_data=['State', 'Population'],
      color_discrete_sequence=['fuchsia'],
      zoom=3,
  )
  fig.update_layout(mapbox_style='open-street-map')
  fig.update_layout(margin={'r': 0, 't': 0, 'l': 0, 'b': 0})
  fig.update_layout(
      updatemenus=[
          dict(
              buttons=list(
                  [
                      {
                          'args': ['type', 'option1'],
                          'label': 'Option 1',
                          'method': 'restyle',
                      },
                      {
                          'args': ['type', 'option2'],
                          'label': 'Option 2',
                          'method': 'restyle',
                      },
                  ]
              ),
              direction='down',
              x=0.075,
              xanchor='right',
              yanchor='bottom',
          ),
      ]
  )
  fig.show()
  </code></pre>
  <p>I want to have all states listed in the dropdown menu, with an option to plot all data points of all states when set to <code>all</code> or <code>option1</code> or whatever the name is, or alternatively, to select a state and only the data points belonging to the state to be shown and the rest discarded.</p>