> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/ja/llms.txt)
# Change a map's worldview
This example shows how to specify a **worldview** when creating a map and how to change worldviews dynamically after a map has been created. Worldviews are used to change map features to fit the context of various regional, cultural, or political groups.
The map is instantiated using the [`worldview`](https://docs.mapbox.com/mapbox-gl-js/ja/api/map/#map-class-parameters-options-worldview) option, explicitly setting the worldview to United States (`US`). When the user clicks a worldview button, `Map.setWorldview()` is called to update the map's worldview.
To see a full list of supported worldviews, see the [Internationalization and Localization guide](https://docs.mapbox.com/help/dive-deeper/maps-internationalization/).
> Example code:
**JavaScript**
```html
Change a map's worldview
```
**React**
```jsx
import React, { useEffect, useRef, useState } from 'react';
import * as mapboxgl from 'mapbox-gl/esm';
import 'mapbox-gl/dist/mapbox-gl.css';
const buttonStyle = {
display: 'inline-block',
position: 'relative',
cursor: 'pointer',
width: '20%',
padding: '8px',
border: 'none',
borderRadius: '3px',
marginTop: '10px',
fontSize: '12px',
textAlign: 'center',
color: '#fff',
background: '#ee8a65',
fontFamily: 'sans-serif',
fontWeight: 'bold'
};
const worldviews = [
{ code: 'CN', label: 'China' },
{ code: 'IN', label: 'India' },
{ code: 'JP', label: 'Japan' },
{ code: 'US', label: 'United States' }
];
const activeButtonStyle = {
background: '#c45f38'
};
const MapboxExample = () => {
const mapContainerRef = useRef(null);
const mapRef = useRef(null);
const [activeWorldview, setActiveWorldview] = useState('US');
useEffect(() => {
mapRef.current = new mapboxgl.Map({
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
accessToken: 'YOUR_MAPBOX_ACCESS_TOKEN',
container: mapContainerRef.current,
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio
style: 'mapbox://styles/mapbox/standard',
center: [88, 26],
zoom: 4,
worldview: 'US'
});
return () => mapRef.current.remove();
}, []);
const handleClick = (worldviewCode) => {
// Use setWorldview to switch the map's worldview.
mapRef.current.setWorldview(worldviewCode);
setActiveWorldview(worldviewCode);
};
return (