You can create checkout_cart_index.xml in your Magento_Checkout custom theme.
Visit below path –
app/design/frontend/Vendor/theme/Magento_Checkout/layout/checkout_cart_index.xml
And add the below code:
<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceBlock name="checkout.cart.shipping">
<arguments>
<argument name="jsLayout" xsi:type="array">
<item name="components" xsi:type="array">
<item name="block-summary" xsi:type="array">
<item name="children" xsi:type="array">
<item name="block-shipping" xsi:type="array">
<item name="children" xsi:type="array">
<item name="address-fieldsets" xsi:type="array">
<item name="children" xsi:type="array">
<item name="region_id" xsi:type="array">
<item name="config" xsi:type="array">
<item name="componentDisabled" xsi:type="boolean">true</item>
</item>
</item>
<item name="region" xsi:type="array">
<item name="config" xsi:type="array">
<item name="componentDisabled" xsi:type="boolean">true</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</argument>
</arguments>
</referenceBlock>
</body>
</page>

