Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

[Microsoft.SharePoint.SPSite] $site = Get-SPSite http://test/site

foreach ($web in $site.AllWebs)
{
    foreach ($list in $web.Lists)
    {
        if ($list.Fields.ContainsField("State"))
        {
            foreach ($item in $list.Items)
            {
                if ($item["State"] -eq "Texas")
                {
                    # Add this to a CSV, or Write-Host, or whatever
                }
            }
        }
    }
}