Have the country in craft.commerce.countriesList default Is there a way I can have the array from craft.commerce.countriesList automatically default to the country my store is in?
Not particularly proud of this code, but if you want to do it from Twig, something like this:

{% set countryList = ['United Kingdom', 'United States'] %}

{% for country in craft.commerce.countriesList() %}
    {% if country != 'United Kingdom' and country != 'United States' %}
        {% set countryList = countryList|merge([country]) %}
    {% endif %}
{% endfor %}

&lt;ul&gt;
    {% for country in countryList %}
        &lt;li&gt;{{ country }}&lt;/li&gt;
    {% endfor %}
&lt;/ul&gt;